"""
if...elif...else...

闰年如何判断？

"""
year = 2024

if year % 4 ==0:
    pass
elif year % 400 ==0:
    pass
else:
    pass

if year % 4 == 0 and year % 100 != 0:
    print(year,"是闰年")
elif year % 400 == 0:
    print(year,"是闰年")
else:
    print(year,"不是闰年")